Valve-gear for steam-engines



(No Model.) 2 Sh eetsSheet 1. E. O'NEILL.

VALVE GEAR FOR STEAMENGINEK No. 278,451 Patented May 29,1883.

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E. ONEILL.

VALVE GEAR FOR STEAM ENGINES.

Patented May 29,1883.

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i the exhaust-valve and UNITED STATES PATENT OFFICE, I

EUGENE ONEILL, OF SAN FRANCISCO, CALIFORNIA.

VALVE-G EAR FOR STEAM-ENGINES.

SlPEGIFICATION, forming part of Letters Patent No. 278,451, dated May29, 1883.

- l Application filed February 27, 1883. (No model.)

To all whom it may concern:

Be it known that I, EUGENE ONEILL, of

the. cityand county of San Francisco, State of California, have inventedan Improved Valve- Gearfor Engines; and I hereby declare the followingto be a full, clear, and exact description thereof.

1 My invention relatesto certain improvements in valve-gear for engines;and it consists, mainly, in a mechanism by which the eccentrics actuatethe valves and in an im proved construction of the valves and theirseats, and also in a means for connecting the exhaust-valve stems withthe actuating-levers,

all of which will be more fully explained by reference to theaccompanying drawings, in which- Figure 1 is a vertical section. 8 areside views.

My invention is shown in the present case as applied to an engine havinga horizontal cylinder, A, with steam-valves B andexhaustvalvesB, thesame being duplicated at the other end of the cylinder.

In my patent of May 25, 1880, the steam and the exhaust valves are bothoperated from above by suitable stems; but the stems of theexhaust-valves pass up through hollow sleeves, and their seats must beremoved through the top, thus requiring considerable work when it isnecessary to gain access to the exhaust-valves.

In my present invention each steamvalve B has a stem, 0, passing upthrough the top of the steam-chest and connected with theactnatingmechanism, as will be described hereinafter. The exhaust-valvesB havestems D, which pass downward through stuffing-boxes at the bottom, asshown.

E is a plate or cover for the front of the Figs. 2 and steam-chest E,and the opening caused by its removal is of a size sufficient, after thesteamvalve is raised 'to its highest point, to admit its seat F, whichmay thus be introduced or removed without interfering with the steam-valves. The exhaustvalve seats F have sleeves or extensions Grprojecting downward from them and screwthreaded at their lower ends, sothat the studing-boxes H may be screwed upon them, and thus draw themclosely to their places, where they are firmly held. When they are to beafter removing the seats may be removed through the dependently by itsown eccentric I, these 89- centrics being secured to a horizontal shaft,J, which extends from the crankshaft to a point The steam-valvesopposite the cylinder and parallel with it,-be-

ing driven by gearing from the crank-shaft. The eccentric rods K connectwith the oscillatin g toes or lifters L, and these lift the levers M, towhich the lower ends of the exhaust-valve stems are connected, thusopening and closing the exhaust-valves at the proper time. The encentrio-rods N connect with the rocking arms 0, which actuate thelifting-toes P, and these latterraise the levers Q, by which thesteam-valves are opened. The steam-valve stems O are con nected with theslotted bars or frames R, with in which the oscillating tripping-blocksS are hung, and these blocks are actuated by the ec centrics T, and thelinks U, and rocking arms V, so as to determine the point at which steamshall be cut off. The levers Q have anti-frictional rollers W mountedupon them at the points beneath the blocks S, so that when the leversare lifted by the toes or lifters P these rollers lift the blocks S, andwith them the valve-stem 0, so as to open the steam-valves and keep themopen until the action of the out 01f eccentric and the governor upon theblock turns it so that it drops from the roller and allows the valve toclose. This cut-oft mechanism is fully described in my patent of January30, 1883, No. 271,352 but my present improvement consists in theemployment of the levers Q and the anti-friction rollers W in place ofblocks, which were formerly used, and which would be liable to becomeclogged by this construction and the employment of independenteccentrics for each valve, with the short eccentric-rods, I am enabledto set each valve exactly without disturbing either of the others, andthe short rods being less afl'ected, to lengthen or shorten them by heatand cold,

the adjustment of the valves remains correspondingly more perfect.

The levers M and Q by their length and weight insure the prompt closingof the valves dust. By

ICO

cular faceswill roll slightly. within the blocks when released, and therollers W relievethe blocks from dauger'of breakage. As the point wherethe valve-stems D connect with the levers M moves slightly in the arc ofacircle, I prevent the side movement of the stem as follows: The lowerend of the stem is secured to a yoke, a, within which the blocks 11 arefitted to slide slightly. These blocks have their-inner faces madeconcave to fit the enlarged circular faces 0 of the lever M, so that asthe lever rises and falls about its fulcrum thesecirr' b, and the blocksslide a little within the yoke to compensate for the slight arc of acircle made by the movement of the lever about its fulcrum.

Having thus described my invention, what I claim as new, anddesire tosecure by Letters Patent, is-

1. In an engine having the independent superposed steam and exhaustvalves 13 B,

' the movable exhaust-valve seat F, with the sleeve or extension G,through which the valvestem may pass downward from the valve, and;

the stufling-box H, screwed upon the extension to" hold the valve-seatto its place, substan tially as herein described.

2. In an engine having the superposed steam and exhaust valves B'Bwithinthe steamchest E, the valve-stems G andD, extending out through the topand bottom of the valvechest from their respective valves, incombination with the levers M and Q, the toes or lifters L and P, andthe independent eccentric I for each valve and'dri'vi'ng-shaft J,substantially as herein described.

3. The steam valve rod O,connected with the slotted bar R, and theoscillating trippingblocks S of the cut-off mechanism, in combina tionwith the lever Q, with the anti-friction roller W, the toe or lifter IE,and the eccentric and rocker-arm, substantially as herein described.

4. Thelever M, having the enlarged circular faces a, and the valve-stemD, with its yoke a, in combination with the blocks 1), fitting the facesa, and said lever Madapted to slide within the yoke, so as to preventside movement of Y the valve-stem, substantially as herein described.

. In witness whereof I hereunto set my hand.

EUGENE ONEILL.

Witnesses:

JAMES DALY, J. H. BLOOD.

